Straight-way nozzle body for impulse wheels



July 14, 1942. KAMMERER 2,289,432

STRAIGHT-WA}? uozzms BODY FOR IMPULSE WHEELS Filed May '7, i941 INVENTOR. I 1510M Km mere? A1124 ATTOR/VF) Patented July 14, 1942 STRAIGHT-WAY NOZZLE BODY FOR IM- PULSE WHEELS Franz Kammerer, Heidenheim-on-the-Brenz,

Germany, assignor to American Voith Contact 00. Inc., New York, N. Y., a corporation of New York Application May 7,1941, Serial No. 392,226 In Germany July 12, 1940 1 Claim.

The invention has as object a nozzle body, so as it is used with impulse-wheels with straight flow nozzles. With usual designs of such straight flow nozzle bodies the waterflow is bifurcated at the inlet in two halves of circular area and led on each side of the needle operating mechanism. At the orifice of the nozzle the two halves meet in one section of circular area of the double size of each half. At the place where the two branches meet the water is given a chance to make eddies and other turbulences which badly influence the effic-iency of the whole nozzle and, therefore, of the complete turbine.

The present invention has for its object to avoid the above named drawbacks by giving the branch pipes a section of semicircular shape instead of full circular shape. By this arrangement, the circular water flow which exists at the inlet of the nozzle is bifurcated into two halfcircles, and this shape is kept on up to the union of the two branches shortly before the orifice. With this shape of the branch flows, no eddies can arise at their union because now two halfcircles meet to form the full circle of the inlet shape and this meeting is so smoothly done that no turbulence or any other trouble could arise.

The drawing shows a nozzle with a body shaped according to the invention.

Fig. 1 is a horizontal section through the nozzle body,

Fig. 2 a view facing the dividing flange of the body.

The nozzle body consisting of the three main parts a, b and c is divided into the halves e and ,f by the space occupied by the needle operating mechanism d. Fig. 2 shows the half circular shape of the two branch flows e and ,f, originating from the full circular section of the body inlet at 9.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

In a nozzle body for impulse wheel with straightway nozzles and needle operating mechanism, the combination of a nozzle body divided into halves by the needle operating mechanism, and having a circular inlet, and a circular outlet controlled by the needle of said mechanism, said needle operating mechanism dividing the interior space of the nozzle body into two halves, and a semi-circular and fiat walled section for each half, said section beginning at the inlet end of said body and extending to the outlet end, whereby the circular water flow which exists at the inlet of the nozzleis bifurcated into two half circles, and this shape is kept on up to the union of the two branches shortly before the outlet end under avoidance of eddy currents at the needle.

FRANZ KAMMERER. 

